// Copyright © 2019 The Things Network Foundation, The Things Industries B.V.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package nats

import (
	"fmt"
	"strings"
)

func combineSubjects(s1, s2 string) string {
	s1 = strings.Trim(s1, ".")
	s2 = strings.Trim(s2, ".")
	if s1 == "" {
		return s2
	}
	if s2 == "" {
		return s1
	}
	return fmt.Sprintf("%s.%s", s1, s2)
}
